本文用电导法研究了4＇-苯多烯酰基吡啶化合物4 pOnB中吡啶基的化学活性。反应动力学数据表明,4pOnB与碘乙烷在丙酮溶液中为二级反应,相关系数r均大于0.995。共轭主链的长度(n)对反应活化能的影响不大,这表明三岔共轭体系中基干结构的共轭作用不能通过三岔点影响吡啶环上氮原子的电子云密度。三岔共轭体系中较短的一支分岔与三岔体系中的共轭基干结构是互相隔离的,仅起代基作用。 In this paper, the chemical activity of pyridyl groups in 4’-phenyl polypyridyl compound 4 pOnB was studied by conductivity method. Reaction kinetics data show that 4pOnB and iodoethane in acetone solution for the second reaction, the correlation coefficient r greater than 0.995. The length of the conjugated backbone (n) has little effect on the activation energy of the reaction, indicating that the conjugation of the backbone structure in the trifurcated conjugated system can not affect the electron cloud density of nitrogen atoms on the pyridine ring through the triple point. The short branch of the trifurcated conjugated system and the conjugated basic structure of the trifurcated system are isolated from each other and only act as the substituent.